Regarding Storage Administrator's Guide 11g Release 1 for ASM disk capacity
Hi, All.
I like to know the description in "Oracle Database Storage Administrator's Guide 11g Release 1 (11.1)".
In Ch.4, Managing Capacity in Disk Groups, it says the following.
When ASM provides redundancy, such as when you create a disk group with NORMAL
or HIGH redundancy, you must have sufficient capacity in each disk group to manage
a re-creation of data that is lost after a failure of one or two failure groups. After one or
more disks fail, the process of restoring redundancy for all data requires space from
the surviving disks in the disk group. If not enough space remains, then some files
might end up with reduced redundancy
Is the above saying you would need to have free space in surviving failgroup to store the
whole data that will be restored, i.e, need to have twice of ASM disk(s) in size compared
to the actual data size for each failgroup in case one failgroup completely gets lost ?
If it's correct, does it mean that the data is at first restored in the surviving failgroup during
restoring redundancy and then moved to the new(restored) failgroup ?
Any reply will be very much appreciated.
Thanks.
Hideki